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We study phonons generated by current in a Pt nanowire, by measuringresistance of another nanowire separated from the first one by an insulatingspacer. For thin spacers, the resistance varies almost linearly with current atcryogenic temperatures, while an additional quadratic contribution emerges forthicker spacers. These observations suggest a non-thermal distribution ofcurrent-generated phonons that relax via strongly nonlinear dynamical processesrather than few-phonon scattering. Our results provide insight into thenonequilibrium phonon dynamics at nanoscale, which may facilitate efficientheat management in electronic nanodevices.

Transport and relaxation of current-generated nonequilibrium phonons from nonlocal electronic measurements